Hi! =] I was shopping at walmart lately and in the section with kitchenware where the jars are there's a lidded jar for storing food in (or flour/sugar most likely=P) that's 2 gallons! I was considering it for a tank for ADFs The best part is it's completely cylendrical and not curved at the top so the heater cord won't be smack dab in the middle of your tanks it can be against the back of it and you could hide it with a silk plant. I hope this helps =] Oh! the jar was 12 dollars in Virginia idk how much it will be where you are though. =/

ACTUALLY. I lied. The heater was doing its job... at first. This morning, however, I woke up to a fish in cold water. Even in a relatively small tank, that heater was just not powerful enough. I visited three (three!) pet stores today and tracked down a Marineland 10 watt. I've got my fingers crossed that it'll work like it's supposed to.